JP2014145154A - Post-construction bent anchor bolt and construction method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anchor bolt, namely a post-construction anchor bolt which avoids a disadvantage that the bolt is apt to fall out due to a load of a suspended object when a pulling direction of the suspended object and a direction of a hole into which a linear anchor bolt is inserted are identical, and a construction method of the same.SOLUTION: An anchor bolt has, in the middle thereof, a bent part at the same angle as an inclination angle at which the anchor bolt is inserted into a hole having the inclination angle inclined from a direction perpendicular to a concrete surface. The anchor bolt becomes right-angled to the concrete surface outside the concrete. There are provided: means equipped with a connector for fixing the anchor bolts inserted in the opposite directions of each other so that a distance parallel to the concrete surface between the parts exposed outside of the concrete of the anchor bolts is not changed; and a construction method of the anchor bolt.

Description

The present invention relates to a post-installed anchor bolt that withstands heavy lifting and is difficult to come off.

There are two types of anchor bolts: pre-installed anchor bolts and post-installed anchor bolts. However, the former can be strengthened by laying the concrete and then setting the concrete before laying the concrete. The latter has a disadvantage that it is easy to come out because it is a straight bar shape because it can not be tied to a reinforcing bar etc. after drilling concrete and drilling holes and inserting anchor bolts and hardening. Because it can be attached to the, it is frequently used. As the latter solidification means to the concrete hole wall, there are a metal expansion type and an adhesion type, and the former has a drawback that stress is applied to the contact surface of the concrete because the metal tool is spread and pressed against the concrete wall. The adhesive type is often used because it adheres to the concrete wall with an adhesive, so that stress distortion does not occur and it can be easily constructed. Adhesives cannot secure adhesive force unless they uniformly enter the contact interface, but if there is a hole opening underneath, they may not enter well due to dripping, and there are many proposals for improvement.
In either case, the post-installed anchor bolt is resistant to breakage when a hole is made in the concrete foundation and the anchor bolt is mounted, because the force due to the load of the object supported by the anchor bolt is applied to the concrete as a compressive force. However, when a concrete foundation such as a ceiling is drilled from below and anchor bolts are inserted from below and suspended, the force due to the load of the object is applied to the concrete wall as a shear tensile force. Since concrete is easily peeled off because it is weak against a pulling force parallel to the surface so that powder is easily generated when the surface is rubbed with a nail or the like, the load is deteriorated and the anchor bolt is likely to come off due to peeling.

FIG. 3 is a view showing a construction state of a conventional post-construction anchor bolt. In particular, this is the case when used in a suspended state on a concrete wall.
In 3-A, the anchor bolt 301 is inserted into the concrete wall 302 and solidified. The anchor bolt 301 is applied as a shearing force 304 parallel to the contact wall surface of the concrete because the load of the suspended object (not shown) is applied in the direction of the arrow 303.
3-B shows a case where a load is applied over a long period of time in the state of 3-A. The concrete interface pulled parallel to the surface by the shearing force is cracked and easily accumulated. In 3-C, the amount of cracks increases and there is no force that can support the load of the suspended object, and the anchor bolt is removed together with the suspended object. In the metal expansion type, it is conceivable that concrete scraps are attached to the metal surface, and in the adhesion type, the anchor bolt is attached with an adhesive and the concrete scraps are removed on the anchor bolt. In this example, the straight anchor bolts are inserted into holes that are perpendicular to the plane of the concrete, so the load force and the direction of removal are the same, so there is a drawback that it is particularly easy to remove. . In 3-D, a case where a plurality of linear anchor bolts are inserted into a hole formed at a right angle to the plane of the concrete to receive the load of one suspended object is shown, but the load can be sustained by being distributed to the number of bolts. However, since the load force and the direction of the bolt hole (the direction of removal) are the same, it has the disadvantage of being easily removed.
Thus, in many cases, linear anchor bolts are used in many examples, and many improvements have been proposed. As an example, Patent Document 1 discloses a construction method in which an adhesive is covered with concrete so as not to touch fire. Patent Document 2 proposes providing a through groove for allowing an adhesive to pass through the central axis of an anchor bolt. Although it is not a case of suspending, in Patent Document 3, when attaching an anchor bolt for attaching a handrail or the like to a reinforced concrete floor board or its dam wall in the post-construction, sometimes the bolt hole hits the reinforcing bar, so as to avoid this There is a suggestion to make a hole at a slant only for the bolt that hits.
In summary, the post-installed anchor bolts are used in many examples because they are easy to construct. However, they are weak against the shearing force caused by the load of the suspended object, and the pulling direction of the suspended load and the insertion of the linear anchor bolt are particularly important. If the direction of the slot is the same, there is a great risk of bolt dropout.

JP2009-263958 JP2005-9255 JP2009-41312A

Post-installed anchor bolts and construction methods that avoid the disadvantage of bolts being easily pulled out by the load of the suspended object when the pulling direction of the suspended load and the direction of the hole into which the linear anchor bolt is inserted are the same in the conventional anchor bolt as described above. Is to provide.

The post-construction bent anchor bolt and its construction method of the present invention are anchor bolts having a bent portion in the middle at the same angle as the inclination angle inserted into a hole having an inclination angle inclined from a direction perpendicular to the concrete surface. On the outside of the concrete, the anchor bolt is perpendicular to the concrete surface, and the anchor bolts inserted in opposite directions are fixed so that the distance in the direction parallel to the concrete surface of the anchor bolt does not change It is a thing provided with a space | interval fixing tool, and its construction method.
Hereinafter, it describes along a claim.

The invention according to claim 1 is a post-construction bent anchor bolt,
An anchor bolt inserted into a hole opened at an inclination angle inclined with respect to a direction perpendicular to the surface of the concrete wall for post-construction to suspend an object on the concrete wall. A linear rod-shaped portion, a second linear rod-shaped portion integrally connected to the linear rod-shaped portion with an inclination angle equal to the inclination angle, and a threaded portion in which a screw is cut at least on the surface of the second linear rod-shaped portion. And a pair of at least two anchor bolts inserted into the holes in opposite directions.

The invention according to claim 2 is a post-construction bent anchor bolt according to claim 1,
An interval fixing tool for fixing the pair of anchor bolts between the pair of anchor bolts so as not to change a distance in a direction parallel to the concrete wall between the pair of anchor bolts outside the concrete wall, To do.

According to a third aspect of the present invention, in the post-construction bent anchor bolt according to any one of the first or second aspects, the spacing fixture has a connection hole provided in the second straight bar-shaped portion. It has the tubular part which has a hole which lets a joint part or a 2nd straight rod-shaped part pass.

According to a fourth aspect of the present invention, in the post-construction bent anchor bolt according to any one of the first to third aspects, the bolt is integrally attached to the first straight bar-shaped portion, and is turned into the hole by turning it. A polygonal bolt head for assisting insertion or removal is provided.

The invention according to claim 5 is the post-construction bent anchor bolt according to claim 4,
A washer that is inserted into the first straight bar-like portion and has one side inclined at the same angle as the tilt angle is provided on the tip side of the first straight bar-like portion from the bolt head.

A sixth aspect of the present invention is the post-construction bent anchor bolt according to any one of the first to fifth aspects, wherein the inclination angle is between 10 ° and 45 °.

A seventh aspect of the present invention is a post-construction bent anchor bolt construction method according to any one of the first to sixth aspects, wherein the holes having the inclined angles are formed in the concrete wall in opposite directions, and the anchor bolt A pair is inserted, and the pair of anchor bolts is fixed with the spacing fixture.

Since it is configured as described above, in the post-construction bent anchor bolt and its construction method, the bolt is unlikely to be detached even by a hanging load.

It is a figure which shows one embodiment of the post-construction bending anchor bolt by this invention. It is a figure which shows one embodiment of the construction state of the post-construction bending anchor bolt by this invention. It is a figure which shows the construction state of the conventional post-construction anchor bolt.

A post-construction bent anchor bolt according to the present invention is an anchor bolt having a bent portion in the middle at the same angle as the inclination angle inserted into a hole having an inclination angle inclined from a direction perpendicular to the surface of the concrete. On the outside, the fixed distance is fixed so that the distance in the direction parallel to the concrete surface of the anchor bolt does not change at the part of the anchor bolt inserted in the opposite direction to the concrete surface at the outside of the concrete surface. You can have tools. This will be described below with reference to the drawings.

FIG. 1 is a view showing an embodiment of a post-construction bent anchor bolt according to the present invention. In 1-A, the anchor bolt 100 has a first straight bar-shaped part 101 inserted into a concrete hole and a second straight bar-shaped part 102 integrally connected to the first straight bar-shaped part 101 at a predetermined inclination angle. The surface of the second straight bar-like portion 102 has a threaded portion 103 with a screw.
1-B is provided with a bolt head 110 such as a hexagon bolt head so that it can be turned with a monkey spanner or the like for convenience when screwing the first straight rod-like portion 101 into a concrete hole. In 1-C, when the first straight rod-like portion 101 is inserted into a hole in the concrete, the inclined washer 120 has an inclined surface that is interposed between the concrete surface and the bolt head 110 to improve contact. It is an example provided with. The angle of the inclined surface is set to be the same as the inclination angle of the first straight bar-shaped part 101 and the second straight bar-shaped part 102.
In consideration of the fact that the second straight bar-shaped portion 102 is directed vertically downward when the suspended object is suspended, and the effect is small when the angle is small, the inclination angle is preferably 45 °. It is irrelevant when the anchor bolt is struck, but when it is screwed into a concrete hole so as not to give distortion to the impact, the second straight bar-shaped portion 102 hits the concrete surface at 45 ° or more, so that it is full. It cannot be inserted. Therefore, it is preferable to set the angle between 10 ° and 45 °. The inclination angle may be given from the beginning, or may be given by bending a straight rod-like bolt after being inserted into the concrete hole.

FIG. 2 is a view showing one embodiment of a construction state of a post-construction bent anchor bolt according to the present invention.
2A shows a state where the anchor bolt 100 of 1-A is inserted into the concrete wall 200 for construction. The same applies to other constructions indicated by 1-B and 1-C. In this example, an anchor bolt 100 having an inclination angle set to 35 ° is used, and a concrete hole is also formed with a corresponding inclination. The direction of the load of the suspended object not shown and the pulling stress for the anchor bolt 100 to come off are misaligned by an inclination angle and are difficult to come off.

In 2-B and 2-C, the anchor bolt which has a means for connecting bults and making it more difficult to pull out is shown. In 2-B, the second straight bar portion 102 of the anchor bolt 100 is provided with a coupling portion 211. A plurality of the anchor bolts 100 are inserted so as to be inclined in opposite directions, and are connected to each other using a connecting bar 212 and a bolt nut not shown. In 2-C, it is an example provided with the tubular part 213 by which the 2nd linear rod-shaped part 102 is inserted in the front-end | tip of the connection bar 212. FIG. The tubular portion 213 with the connecting bar 212 is passed through each anchor bolt 100, and the connecting bars 212 are connected to each other using a bolt nut or the like. In 2-B, the connection bar 212 and the coupling part 211, and the connection bar 212 and the tubular part 213 are the spacing fixtures 210 in 2-C.

A plurality of anchor bolts 100 are inserted and used so as to be inclined in opposite directions. In 2-D, the anchor bolt 100 shown in 1-C is used. Of course, the same applies to other items. In this example, two anchor bolts 100 are shown and are inserted into the concrete wall 200 at appropriate intervals so as to be inclined in opposite directions. The connecting bars 210 are screwed and connected using the interval fixing tool 210 shown in 2-C. The direction in which the anchor bolt 100 is pulled out is opposite to the downward force of the load of the suspended object, and in the figure, the direction is close to each other, but the two anchor bolts 100 are fixed by the distance fixing tool 210. Since they are connected at intervals and the intervals cannot change, it is difficult for omissions to occur. In 2-E, the direction of the insertion of the anchor bolt 100 is opposite to that in 2-D, and the situation is the same, with the difference that the anchor bolt 100 has a “C” shape.
In addition, since a suspended object can fulfill | perform by fixing the same effect as a connection bar to a suspended object (a lateral distance of a fixing | fixed part does not change), it is also possible to abbreviate | omit a connection bar.

As described above, in the post-construction bent anchor bolt and its construction method according to the present invention, the direction of the load of the suspended object and the direction of the bolt removal are different so that the distance between the bolts inserted at opposite inclinations does not change. Since it is fixed with a connecting bar, it does not move in the direction in which the bolt is pulled out, so it is difficult to put out the bolt, which is extremely effective for industrial use.

DESCRIPTION OF SYMBOLS 100 Anchor bolt 101 1st straight bar-shaped part 102 2nd straight bar-shaped part 103 Threaded part 110 Bolt head 120 Inclined washer 200, 302 Concrete wall 210 Space | interval fixing tool 211 Connection part 212 Connection bar 213 Tubular part 301 Anchor bolt 303 Arrow 304 Shear force

Claims (7)

An anchor bolt inserted into a hole opened at an inclination angle inclined with respect to a direction perpendicular to the surface of the concrete wall for post-construction to suspend an object on the concrete wall. A linear rod-shaped portion, a second linear rod-shaped portion integrally connected to the linear rod-shaped portion with an inclination angle equal to the inclination angle, and a threaded portion in which a screw is cut at least on the surface of the second linear rod-shaped portion. A post-installed bent anchor bolt characterized by comprising a pair inserted into the hole in which at least two anchor bolts are opposite to each other. An interval fixing tool for fixing the pair of anchor bolts between the pair of anchor bolts so as not to change a distance in a direction parallel to the concrete wall between the pair of anchor bolts outside the concrete wall, The post-construction bent anchor bolt according to claim 1. The said space | interval fixing tool has the tubular part which has the coupling | bond part which has the connection hole with which the 2nd straight bar-shaped part was equipped, or the hole which lets a 2nd straight bar-shaped part pass. The post-construction bent anchor bolt described in any one of 2 above. 4. A polygonal bolt head that is integrally attached to the first straight bar-like portion and that is rotated to assist in insertion or removal from the hole. The post-construction bent anchor bolt described in any one of the above. 2. A washer that is inserted into the first straight bar-like portion and has one surface inclined at the same angle as the tilt angle, on the tip side of the first straight bar-like portion from the bolt head. Item 4. Post-construction bent anchor bolt. The post-construction bent anchor bolt according to any one of claims 1 to 5, wherein the inclination angle is between 10 ° and 45 °. The hole having the inclined angle is formed in the concrete wall in opposite directions, the pair of anchor bolts is inserted, and the pair of anchor bolts are fixed with the interval fixing tool. The post-construction bent anchor bolt construction method according to claim 6.

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